Having worked in the health & safety industry for many years (forestry and nuclear), it's amazing to see the damage that can happen so quickly and the lifelong effects it can have on people (and their families). Part of my job was to prepare safety alerts and industry alerts as warnings to send out to workers along the lines similar to what was shown in this threads original message. It doesn't matter if it was negligence, inexperience or just a 'freak' accident -- whatever it is, it takes literally a second to change a life permanently. I'm glad these kinds of alerts are sent out and learned from on such a wide level as a standard.
The two saddest stories we worked on was 1) The one worker who was literally two days from retirement, who had a kickback on his chainsaw and bled to death... and 2) The 16 year-old kid who worked in his father's family-run mill and had his head crushed while he tried to dislodge a stuck object in a laser-guided processor. My point is, it doesn't matter if you're 16 or 65 -- injuries/death do not discriminate based on age, job or experience.
Just a side story... Back in the early 1950's (can't remember the exact date), there was a young lad (early teens) in Chalk River who had found an unexploded ordinance on a fishing trip on a river near the base. He brought it home and while his parents were still away at work, decided he wanted to see what was inside of it. So, he grabbed a hand-saw and began to saw through it... needless to say, his parents came home a few hours later to find him and sadly, he didn't survive. I believe it was around this time that CFB Petawawa increased their perimeter fencing and made a public awareness campaign to stop people from touching such items of interest.